Manual

Install the extension...

Install the extension using the installation button in the main website

It works with Firefox / Chrome browsers under Windows / Linux / Mac
OS. Internet Explorer is not yet supported.

...and use it!

Load a web page and enter the product you want to examine. It
is the best to enter the exact product page and rather than
to select the price from a preview where there are many other
products displayed.

Wait until the page loads completely.

Select the price - drag the cursor over the price, or just
double-click it. You don't need to select exactly all the digits, it
is enough that you select the price partially (e.g., only the last
digits). A pop-up should appear. If it does not appear or you cannot
click the text (e.g., the price is a hyperlink), then select the
price, right-click on it, and use check selected text
option.

It is better if you select the price at the product's
final page, not in a "quick view" or a showcase. The algorithm
might get confused. Do not select products in your cart - its
content depends on your browser's current session, and we do not use
your sessions.

The pop-up should appear in the bottom-left corner. Click
Check it to start the experiment.

Now the browser uploads data to the measurement server. Stay calm,
it can take a while... When uploading is finished, the measurement
page should pop-up. If you have a pop-up blocker, you can click
Success text and open the result site manually.

The result page

Although the result page is ready, it does not mean that the measurement had
finished! It takes time for the measurement server to open and process the
examined via different proxies. It can take even a couple of minutes
depending on the server load. The results are fetched automatically once
ready.

Prices

This tab shows the prices of the different variants of the examined product. You
can also preview the fetched web page by clicking on the name of the variant.
Please note that the previewed page probably will not render properly - as it
we store only the html code of the page, not the static elements of the page
like images or CSS.

Domains

We record the domains which the examined page exchanges information with. These
can be CDN, ad server or marketing-related servers.

I see different prices - what does it mean?

The there can be many causes. Our algorithm is not perfect, so it might have
extracted wrong price (you can verify it by previewing the fetched website by
clicking the website's variant name). Maybe currency varies between the
variants. Also, even if the price actually differs between the page variants, it
might be die to multiple reasons, e.g. shipping costs included in the price.

Feedback

Found an example of price discrimination? Or a bug? Or have a comment? You are
welcome to send us a feedback using the feedback button at the bottom-left of
the page.

Q&A and troubleshooting

Q:Pop-up blocker: the result page does not show upA: You can open the result page manually by clicking the success button once the
measurement is run.

Q:Price not found on the web pageA: There can me many causes. For example, the website structure differs so much
that the algorithm fails. Still, you can preview the page to see how does it
look like for another browsing variant.

Q:Queries do not finishA: Server load? A bug? Try again in a minute. If it repeats, send us feedback!

Q:Measurement fails - I see "Failed" text in the popupA: Congrats, you have found a bug. Send us a feedback and write
which page did you want to enter.